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Does salt degrade plastic?

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No - with a few minor qualifiers. Virtually all commonly used plastics are inert to sodium chloride (salt), whether it is in its pure form or dissolved in water, such as the ocean. There is, of course, a temperature limit. read more

UV rays gradually degrade plastic, whether in the presence of salt or not. That’s a topic for a different discussion. Some plastics absorb water from the atmosphere. read more

But in the ocean, which is where a lot of discarded grocery bags, soft drink bottles and six-pack rings end up, plastic is bathed in as much light as water. In 2009, researchers from Nihon University in Chiba, Japan, found that plastic in warm ocean water can degrade in as little as a year. read more

UV rays gradually degrade plastic, whether in the presence of salt or not. That’s a topic for a different discussion. Some plastics absorb water from the atmosphere. Nylon is one of the best examples: a nylon item may absorb up to 8% of its weight in H2O in one year before it reaches equilibrium. read more

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